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Latest Articles

2014-12-05 00:26:35
Some experimentiing with a cheap PAM8403 Class D Audio Amplifier Module results in a very compact and efficient stereo amp with very reasonable sound quality.
2014-11-27 07:13:26
Eight 1-watt LEDS, a couple of cheap eBay modules, some salvaged hardware, and an ATTINY13 make for some very effective workbench lighting. A speed-controlled fan keeps the electronics and LEDs (and potentially the worker) cool.
2014-11-18 04:34:12
A command line utilty that allows a Raspberry Pi to control a HD44780 based LCD via i2c.
2014-11-06 07:15:20
A Raspberry Pi, USB hub and USB HDD are mounted in a box to make a neat little low-power server. Runs from a 12v battery charged by solar power. Uses around 6W as compared to 30W or more of the laptop that it replaces.
2014-10-03 08:34:10
A utility to monitor a Sunny Boy 4000tl solar inverter via its Bluetooth interface. Uses a cheap tl-wr702n wireless router, but should work with any Linux system and with other Sunny Boy inverters.
2014-09-16 05:10:19
A quick-start guide to getting a cross compilation environment up and running on Ubuntu Linux.
2014-01-01 04:30:17
This replacement thermostat for an old refrigerator offers LCD display showing temperature in C or F, 0.5C accuracy and allows target temperature to be set percisely. Uses ATmega8 controller and DS18B20 1-wire sensor.
2013-12-14 22:43:46
Made by bending a coat hanger, this antenna is for 70cm and can be scaled for UHF CB. It works well, especially considering how quick and easy it is to make.
2013-12-03 02:24:40
An interactive map showing Australian amateur radio repeaters. Navigate as required and click on a repeater-site icon to display frequency, ctcss and other details and notes. Display all repeaters or select by band.
2013-11-28 06:02:27
The concepts behind direct digital synthesis (DDS) can be explained without the need for complex maths nor heavy-duty digital electronics theory. This tutorial describes how DDS works in simple and easy to understand terms.
2013-11-25 04:33:18
A minimalist DIY programming and development board for the ATtiny2313 AVR microcontroller. Made on a piece of matrix board using point-to-point wiring.
2013-11-17 17:16:08
A half-wave end-fed for 2m is built from PVC pipe and a couple of meters of RG58 coax. This easily reproducible design from VK2ZOI can be made quickly and performs well. The addition of some tinfoil and sticky tape turns this into a dual-band 70cm collinear.

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